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|
#
# Manually written part of python bindings for libvirt
#
# On cygwin, the DLL is called cygvirtmod.dll
try:
import libvirtmod
except ImportError, lib_e:
try:
import cygvirtmod as libvirtmod
except ImportError, cyg_e:
if str(cyg_e).count("No module named"):
raise lib_e
import types
# The root of all libvirt errors.
class libvirtError(Exception):
def __init__(self, defmsg, conn=None, dom=None, net=None, pool=None, vol=None):
# Never call virConnGetLastError().
# virGetLastError() is now thread local
err = virGetLastError()
if err is None:
msg = defmsg
else:
msg = err[2]
Exception.__init__(self, msg)
self.err = err
def get_error_code(self):
if self.err is None:
return None
return self.err[0]
def get_error_domain(self):
if self.err is None:
return None
return self.err[1]
def get_error_message(self):
if self.err is None:
return None
return self.err[2]
def get_error_level(self):
if self.err is None:
return None
return self.err[3]
def get_str1(self):
if self.err is None:
return None
return self.err[4]
def get_str2(self):
if self.err is None:
return None
return self.err[5]
def get_str3(self):
if self.err is None:
return None
return self.err[6]
def get_int1(self):
if self.err is None:
return None
return self.err[7]
def get_int2(self):
if self.err is None:
return None
return self.err[8]
#
# register the libvirt global error handler
#
def registerErrorHandler(f, ctx):
"""Register a Python function for error reporting.
The function is called back as f(ctx, error), with error
being a list of information about the error being raised.
Returns 1 in case of success."""
return libvirtmod.virRegisterErrorHandler(f,ctx)
def openAuth(uri, auth, flags):
ret = libvirtmod.virConnectOpenAuth(uri, auth, flags)
if ret is None:raise libvirtError('virConnectOpenAuth() failed')
return virConnect(_obj=ret)
#
# Return library version.
#
def getVersion (name = None):
"""If no name parameter is passed (or name is None) then the
version of the libvirt library is returned as an integer.
If a name is passed and it refers to a driver linked to the
libvirt library, then this returns a tuple of (library version,
driver version).
If the name passed refers to a non-existent driver, then you
will get the exception 'no support for hypervisor'.
Versions numbers are integers: 1000000*major + 1000*minor + release."""
if name is None:
ret = libvirtmod.virGetVersion ();
else:
ret = libvirtmod.virGetVersion (name);
if ret is None: raise libvirtError ("virGetVersion() failed")
return ret
#
# Invoke an EventHandle callback
#
def _eventInvokeHandleCallback(watch, fd, event, opaque, opaquecompat=None):
"""
Invoke the Event Impl Handle Callback in C
"""
# libvirt 0.9.2 and earlier required custom event loops to know
# that opaque=(cb, original_opaque) and pass the values individually
# to this wrapper. This should handle the back compat case, and make
# future invocations match the virEventHandleCallback prototype
if opaquecompat:
callback = opaque
opaque = opaquecompat
else:
callback = opaque[0]
opaque = opaque[1]
libvirtmod.virEventInvokeHandleCallback(watch, fd, event, callback, opaque);
#
# Invoke an EventTimeout callback
#
def _eventInvokeTimeoutCallback(timer, opaque, opaquecompat=None):
"""
Invoke the Event Impl Timeout Callback in C
"""
# libvirt 0.9.2 and earlier required custom event loops to know
# that opaque=(cb, original_opaque) and pass the values individually
# to this wrapper. This should handle the back compat case, and make
# future invocations match the virEventTimeoutCallback prototype
if opaquecompat:
callback = opaque
opaque = opaquecompat
else:
callback = opaque[0]
opaque = opaque[1]
libvirtmod.virEventInvokeTimeoutCallback(timer, callback, opaque);
def _dispatchEventHandleCallback(watch, fd, events, cbData):
cb = cbData["cb"]
opaque = cbData["opaque"]
cb(watch, fd, events, opaque)
return 0
def _dispatchEventTimeoutCallback(timer, cbData):
cb = cbData["cb"]
opaque = cbData["opaque"]
cb(timer, opaque)
return 0
def virEventAddHandle(fd, events, cb, opaque):
"""
register a callback for monitoring file handle events
@fd: file handle to monitor for events
@events: bitset of events to watch from virEventHandleType constants
@cb: callback to invoke when an event occurs
@opaque: user data to pass to callback
Example callback prototype is:
def cb(watch, # int id of the handle
fd, # int file descriptor the event occurred on
events, # int bitmap of events that have occurred
opaque): # opaque data passed to eventAddHandle
"""
cbData = {"cb" : cb, "opaque" : opaque}
ret = libvirtmod.virEventAddHandle(fd, events, cbData)
if ret == -1: raise libvirtError ('virEventAddHandle() failed')
return ret
def virEventAddTimeout(timeout, cb, opaque):
"""
register a callback for a timer event
@timeout: time between events in milliseconds
@cb: callback to invoke when an event occurs
@opaque: user data to pass to callback
Setting timeout to -1 will disable the timer. Setting the timeout
to zero will cause it to fire on every event loop iteration.
Example callback prototype is:
def cb(timer, # int id of the timer
opaque): # opaque data passed to eventAddTimeout
"""
cbData = {"cb" : cb, "opaque" : opaque}
ret = libvirtmod.virEventAddTimeout(timeout, cbData)
if ret == -1: raise libvirtError ('virEventAddTimeout() failed')
return ret
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